Abstract
Charrs of the genus Salvelinus from the ultraoligotrophic Lake Dal’nee Maar differ from anadromous Dolly Varden S. malma in larger head with elongated jaws, larger gill cover, lower body with a deep caudal peduncle and short pelvic fins displaced anteriorly, larger number of scales in the lateral line, and larger number of rays in the unpaired fins. The lacustrine charrs also differ from the maternal Dolly Varden population in longer free part of the maxilla, lower widths of the opercular bones, and narrower suspensorium. Polymorphism of mtDNA is low, and unique haplotypes of the D-loop control region are not revealed. The life span of the lacustrine charrs reaches 11 years; and their maximum length and weight are 47 cm and 820 g. The spawning is registered in the fall at the slope of the bottom near the mouth of the single stream flowing into the lake. The abundance of the spawning group slightly exceeds 1000 individuals. This group is recruited from offspring migrating during their early life to the stream with limited food resources, and more numerous progeny remaining in the lake do not reach sexual maturity. The main food sources of adult charrs during summer are planktonic crustaceans, imago of insects, and own juveniles.
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Original Russian Text © E.V. Esin, N.S. Myuge, O.O. Koval’, Yu.V. Sorokin, 2014, published in Voprosy Ikhtiologii, 2014, Vol. 54, No. 6, pp. 704–716.
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Esin, E.V., Myuge, N.S., Koval’, O.O. et al. Isolated charrs of the genus Salvelinus (Salmonidae) from lakes of the Uzon Caldera, Kamchatka: 1. Charr of Lake Dal’nee. J. Ichthyol. 54, 692–705 (2014). https://doi.org/10.1134/S0032945214060046
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DOI: https://doi.org/10.1134/S0032945214060046